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We're now using an official image for FRR. Also, by default, BGPD will accept routes only if their next-hop is reachable. This relies on a mechanism called NHT (Next Hop Tracking). However, when we receive routes from Kubernetes clusters, the peers usually advertise addresses that we are not directly connected to. This causes these addresses to be filtered out (unless the route reflector is running on the same VPC or Layer 2 network as the Kubernetes nodes). To accept these routes anyway, we basically disable NHT, by considering that nodes are reachable if we can reach them through our default route.